Having a nice set of Apex or whatever wheels will make your car stand out a little more. Better than the heavy 30+ lb junk you can buy. Will it make your car any faster around the track? Barely.
You need pcmtec to use that sensor, so it's a matter of if/when that comes to the S650, the S550 guys have been doing it
https://www.mustang6g.com/forums/threads/interest-in-sensor-based-flex-fuel-install-guide-write-up.196922/
And as far as Flex fuel on a boosted car goes...talk to your...
Stock.
How many miles on them? If you have factory Iridium plugs in there, I wouldn't even change them unless you have 100k on the car.
These plugs are like $10 each, it's not like the old 302 when you could spark plugs for $1 each and it was no big deal to change them all the time.
Bet you wouldn't even notice.
1.0 to 0.5 mpg, maybe
2-3mpg from just switching to a certain brand is re-fuckin-diculous
even if you went from 5W-30 to 0w-20
especially on a car that gets 15 city 24 hwy!
that would be a 10% difference on the highway. You'd also see a huge jump in HP which we...